Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2022c1f136067f673964dcaffa1cae1008ddcd74
Commit: 2022c1f136067f673964dcaffa1cae1008ddcd74
Parent: 4ca8ad7e4c38cd7f32b11e60418d06fa912a1a37
Author: Russ Anderson <[EMAIL PROTECTED]>
AuthorDate: Thu Jan 3 10:23:49 2008 -0600
Committer: Tony Luck <[EMAIL PROTECTED]>
CommitDate: Thu Jan 3 13:22:54 2008 -0800
[IA64] Update Altix nofault code
Montecito and Montvale behaves slightly differently than previous
Itanium processors, resulting in the MCA due to a failed PIO read
to sometimes surfacing outside the nofault code. This code is
based on discussions with Intel CPU architects and verified at
customer sites.
Signed-off-by: Russ Anderson <[EMAIL PROTECTED]>
Signed-off-by: Tony Luck <[EMAIL PROTECTED]>
---
arch/ia64/sn/kernel/xp_nofault.S | 10 +++++++---
1 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/arch/ia64/sn/kernel/xp_nofault.S b/arch/ia64/sn/kernel/xp_nofault.S
index 54e8973..98e7c7d 100644
--- a/arch/ia64/sn/kernel/xp_nofault.S
+++ b/arch/ia64/sn/kernel/xp_nofault.S
@@ -3,7 +3,7 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
- * Copyright (c) 2004-2005 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2004-2007 Silicon Graphics, Inc. All Rights Reserved.
*/
@@ -14,6 +14,11 @@
* PIO read fails, the MCA handler will force the error to look
* corrected and vector to the xp_error_PIOR which will return an error.
*
+ * The definition of "consumption" and the time it takes for an MCA
+ * to surface is processor implementation specific. This code
+ * is sufficient on Itanium through the Montvale processor family.
+ * It may need to be adjusted for future processor implementations.
+ *
* extern int xp_nofault_PIOR(void *remote_register);
*/
@@ -22,11 +27,10 @@ xp_nofault_PIOR:
mov r8=r0 // Stage a success return value
ld8.acq r9=[r32];; // PIO Read the specified register
adds r9=1,r9;; // Add to force consumption
- or r9=r9,r9;; // Or to force consumption
+ srlz.i;; // Allow time for MCA to surface
br.ret.sptk.many b0;; // Return success
.global xp_error_PIOR
xp_error_PIOR:
mov r8=1 // Return value of 1
br.ret.sptk.many b0;; // Return failure
-
-
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